Mach Number Calculator
Enter object velocity and speed of sound (or air temperature) to instantly calculate Mach number and flight regime.
Inputs
Result
Enter values and click Calculate.
Mach Number
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Object velocity
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Speed of sound (c)
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Velocity in km/h
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Velocity in mph
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Flight Regime Reference
| Regime | Mach Range | Examples |
|---|---|---|
| Subsonic | M < 0.8 | Commercial airliners, propeller aircraft |
| Transonic | 0.8 ≤ M < 1.2 | Modern jet fighters at cruise, some airliners |
| Supersonic | 1.2 ≤ M < 5 | Concorde (M 2), SR-71 (M 3.3), rifle bullets |
| Hypersonic | M ≥ 5 | Space shuttle re-entry (M 25), ICBMs |
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Summary
Enter object velocity and speed of sound (or air temperature) to instantly calculate Mach number and flight regime.
How it works
- Choose your input mode: provide the speed of sound directly, or let the tool compute it from air temperature.
- Enter the object's velocity in your preferred unit (m/s, km/h, mph, or ft/s).
- If using temperature mode, enter the ambient air temperature in °C, °F, or K.
- The tool divides velocity by speed of sound to compute the Mach number.
- Read the result along with the flight regime label (subsonic, transonic, supersonic, or hypersonic).
Use cases
- Estimate the Mach number of a commercial aircraft at cruise altitude.
- Check whether a projectile or rocket exceeds the sound barrier.
- Understand aerodynamic regimes in aerospace engineering coursework.
- Convert a known airspeed to Mach for flight planning or simulation.
- Explore how temperature changes affect the speed of sound in air.
- Verify hand calculations for fluid mechanics homework problems.
Frequently Asked Questions
Last updated: 2026-07-23 ·
Reviewed by Nham Vu